The Brazilian gravimetric geoid: MAPGEO2015

Abstract

The official Brazilian geoid model, called MAPGEO2015, was computed as a cooperation between IBGE and EPUSP. It is a 5' x 5' grid of geoidal undulations referred to SIRGAS2000, covering the area from 35° S to 6° N in latitude and from 75° W to 30° W in longitude. The dataset consists of 947,953 terrestrial gravity points (450,589 in Brazil), a digital terrain model based on SRTM and the EIGEN-6C4 global geopotential model up to degree and order 200. The remove-compute-restore procedure was used, where the short wavelength components were computed by Stokes integration via Fast Fourier Transform technique. In areas where sufficient data were available, neural network technique was used to complete the gravity anomaly information. Through the values of normal-orthometric heights of 592 geometric levelling points (RRNN) of the Brazilian High Precision Altimetric Network, it was possible to evaluate the consistency of the geoid undulation model, observing an improvement of approximately 20% compared to the version published in 2010. In particular, the differences between MAPGEO2015 undulations and GNSS/levelling observations show an RMS of 17 cm.

The geoid model is provided in ISG format 2.0 (ISG Format Specifications), while the file in its original data format is available at the model ISG webpage.

Additional Information

The International Service for the Geoid (ISG) was founded in 1992 (as International Geoid Service - IGeS) and it is now an official service of the International Association of Geodesy (IAG), under the umbrella of the International Gravity Field Service (IGFS). The main activities of ISG consist in collecting, analysing and redistributing local and regional geoid models, as well as organizing international schools on the geoid determination (Reguzzoni et al., 2021).

Authors

• Blitzkow, Denizar;Escola Politécnica da Universidade de São Paulo (EPUSP), São Paulo, Brazil;Centro de Estudos de Geodesia (CENEGEO), São Paulo, Brazil
• de Matos, Ana Cristina Oliveira Cancoro;Centro de Estudos de Geodesia (CENEGEO), São Paulo, Brazil
• Machado, Wagner Carrupt;Universidade Federal de Uberlândia (UFU), Monte Carmelo, Brazil
• Nunes, Marcelo Alessandro;Instituto Brasileiro de Geografia e Estatística (IBGE), Rio de Janeiro, Brazil
• Lengruber, Natália Vargas;Instituto Brasileiro de Geografia e Estatística (IBGE), Rio de Janeiro, Brazil
• Xavier, Eduardo Michalzechen Liberal;Instituto Brasileiro de Geografia e Estatística (IBGE), Rio de Janeiro, Brazil
• Fortes, Luiz Paulo Souto;Universidade do Estado do Rio de Janeiro (UERJ), Rio de Janeiro, Brazil

Contact

• Blitzkow, Denisar; Escola Politécnica da Universidade de São Paulo (EPUSP), São Paulo, Brazil;
• de Matos, Ana Cristina Oliveira Cancoro; Escola Politécnica da Universidade de São Paulo (EPUSP), São Paulo, Brazil;
• ISG Staff; International Service for the Geoid (ISG); ➦

Contributors

Reguzzoni, Mirko; Carrion, Daniela; Rossi, Lorenzo; Blitzkow, Denisar; de Matos, Ana Cristina Oliveira Cancoro; ISG Staff

Keywords

Geodesy, Geoid model, ISG, Neural networks, Brazil

GCMD Science Keywords

• EARTH SCIENCE > SOLID EARTH > GEODETICS > GEOID CHARACTERISTICS
• EARTH SCIENCE > SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD > GRAVITY